Samsung and AT&T rolled the Gingerbread update for the infuse 4G through Samsung Kies but they have halted the process since they found out some issues with the 2.3.6 Gingerbread build.
There is said to be a issue plaguing only a small number of users and Samsung and AT&T are working on a fix and they plan to resume the process soon. We’ll advice you to not install the update even if it shows up as the said issue might effect you and it won’t take long before things get back on track.
Source : Pocketnow
